Post-cast strip concrete pouring support-free device and construction method

Abstract

The invention relates to the technical field of post-cast strip concrete pouring construction, in particular to a post-cast strip concrete pouring support-free device and a construction method. The support-free device comprises a plurality of embedded parts which are embedded in a pre-cast structure and are arranged close to a post-cast strip; the lower parts of the embedded parts extend out of the bottom surfaces of the corresponding pre-pouring structures to form connecting parts; the supporting beam is connected to the connecting part, the arrangement direction of the supporting beam is perpendicular to the arrangement direction of the post-cast strip, and the formwork at the post-cast strip is supported through the supporting beam. The formwork at the post-cast strip is hung on the pre-cast structures on the two sides through the embedded parts, the formworks and the supports of the pre-cast structures on the two sides can be completely detached, and therefore no support body is arranged below the post-cast strip in a supported mode, and passing of the lower layer cannot be affected.

Description

Technical Field

[0001] The invention relates to the technical field of post-cast zone concrete pouring construction, in particular to a post-cast zone concrete pouring support-free device and a construction method. Background Art

[0002] In construction, post-cast joints are temporary gaps reserved to mitigate adverse factors such as concrete shrinkage and uneven settlement. Concrete pouring can then be performed after the main structure stabilizes. Traditional post-cast joint enclosed casting primarily utilizes external support structures, such as floor-mounted support frames or independently installed support poles.

[0003] In the existing technology, during the construction of the main structure floor, the post-casting strip formwork is set up simultaneously with the surrounding floor slab frame. The post-casting strip support and formwork are separated from the surrounding frame formwork and supported independently. After the floor slab concrete is poured and cured to reach the design strength, the other frame formwork except the post-casting strip position is removed, and the support formwork at the post-casting strip position is reserved. After the structure shrinks or settles stably, the post-casting strip is poured, and then the lower formwork is removed after curing to meet the design requirements. Due to the long closure period of the post-casting strip, the lower frame needs to be retained for a long time, which has the disadvantages of long-term impact on the passage between the lower floors, low construction efficiency, high frame rental costs, inconvenient operation, and poor environmental protection. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a support-free device and construction method for pouring concrete in the post-cast strip, so as to solve the problems of the existing post-cast strip being supported by a ground-type support frame, which has a long-term impact on the passage between the lower floors, low construction efficiency, high frame rental costs, inconvenient operation and poor environmental protection.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a support-free device for pouring concrete in a post-cast zone, wherein pre-cast structures are formed on both sides of the post-cast zone, and the support-free device comprises:

[0007] A plurality of embedded parts are embedded in the precast structure and arranged near the postcast zone, wherein the lower portion of the embedded parts extends out of the bottom surface of the corresponding precast structure to form a connecting portion;

[0008] A supporting beam is connected to the connecting portion, wherein the setting direction of the supporting beam is perpendicular to the setting direction of the post-casting strip, and the template at the post-casting strip is supported by the supporting beam.

[0009] A further improvement of the support-free device for pouring concrete in the post-cast zone of the present invention is that the connecting portion of the embedded part is provided with an external thread;

[0010] The supporting beam is provided with a connecting hole, and the supporting beam is sleeved on the connecting portion of the embedded part through the connecting hole, and then a double nut is screwed on the connecting portion to realize the connection between the supporting beam and the connecting portion.

[0011] A further improvement of the support-free device for pouring post-cast strip concrete of the present invention is that a fastener is provided between the double nut and the supporting beam, and the fastener is sleeved on the connecting portion.

[0012] A further improvement of the support-free device for pouring post-cast strip concrete of the present invention is that the upper portion of the embedded part is T-shaped, comprising a transverse rod and a vertical rod connected to the transverse rod;

[0013] Reinforced steel bars are provided in the precast structure at the tops of the embedded parts, and the reinforced steel bars are fixedly connected to the top transverse bars of the embedded parts.

[0014] A further improvement of the support-free device for pouring concrete in the post-cast zone of the present invention is that the embedded parts are arranged at intervals along the arrangement direction of the post-cast zone.

[0015] The present invention also provides a construction method for pouring post-cast strip concrete without support, comprising the following steps:

[0016] When constructing the steel bars of the structure on both sides of the post-cast strip, provide embedded parts, lay the embedded parts in the steel bars of the structure on both sides of the post-cast strip and fix them to the corresponding steel bars, and let the lower part of the embedded parts pass through the templates of the structure on both sides of the post-cast strip and extend downward to form a connection part;

[0017] Set up the formwork at the location of the post-casting strip;

[0018] A supporting beam is set below the formwork at the post-casting strip, the setting direction of the supporting beam is perpendicular to the setting direction of the post-casting strip, and the supporting beam is connected to the connecting part, and the supporting beam is used to support the formwork at the post-casting strip.

[0019] A further improvement of the post-cast zone concrete pouring without support construction method of the present invention is that when the supporting beam is provided, the supporting beam is sleeved on the connecting portion through the connecting hole provided thereon;

[0020] Double nuts are screwed onto the connection part, and the supporting beam and the connection part are fastened with the double nuts.

[0021] A further improvement of the support-free construction method for pouring post-cast strip concrete of the present invention is that before screwing the double nut on the connecting portion, a fastener is provided, the fastener is sleeved on the connecting portion, and the supporting beam is supported by the fastener;

[0022] A double nut is screwed onto the connection portion, and the double nut is tightened so that the double nut and the supporting beam clamp the fastener.

[0023] A further improvement of the support-free construction method for pouring concrete in the post-cast strip of the present invention is that, when laying out the embedded parts, reinforcing steel bars are arranged in the steel bars of the structure on both sides of the post-cast strip, the reinforcing steel bars are used to support the top of the embedded parts, and the reinforcing steel bars are fixedly connected to the top of the embedded parts.

[0024] A further improvement of the support-free construction method for pouring concrete in the post-cast zone of the present invention is that, when arranging the embedded parts, the embedded parts are arranged at intervals along the setting direction of the post-cast zone.

[0025] The beneficial effects of the support-free device and construction method for pouring post-cast zone concrete are as follows:

[0026] The present invention uses embedded parts to hang the template at the post-casting zone on the pre-casting structures on both sides. The templates and supports of the pre-casting structures on both sides can be completely removed, so that there is no frame support under the post-casting zone, which will not affect the passage of the lower layer.

[0027] The support-free device and construction method of the present invention do not require a support frame, have high construction efficiency, and are easy to dismantle.

[0028] The support-free device and construction method of the present invention do not require the lower frame to be supported for a long time, thereby reducing the long-term rental and use costs of materials. At the same time, the materials selected by the present invention are easy to obtain and can be reused, which can greatly reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of the support-free device for pouring post-cast zone concrete according to the present invention.

[0030] Figure 2 This is a structural schematic diagram of another preferred embodiment of the support-free device for pouring post-cast zone concrete of the present invention.

[0031] Figure 3 for Figure 2 Top view of the structure shown in .

[0032] Figure 4 This is a bottom view of the post-cast zone concrete pouring support-free device of the present invention supported at the post-cast zone.

[0033] Figure 5 The present invention is a flow chart of the support-free construction method for pouring post-cast zone concrete. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] See Figure 1The present invention provides a support-free device and construction method for pouring post-cast strip concrete, which is used to solve the problems of low efficiency and high cost of traditional frame support for pouring post-cast strip concrete. The present invention replaces the traditional frame support by burying pre-embedded parts in the pre-cast structure, and supports the formwork at the post-cast strip through the connection of the pre-embedded parts and supporting beams, thereby realizing frame-free construction. The device of the present invention has the characteristics of quick installation, strong bearing capacity, and can be used cyclically. The support-free device and construction method for pouring post-cast strip concrete of the present invention are described below with reference to the accompanying drawings.

[0036] See Figure 1 , shows the structural diagram of the support-free device for pouring concrete in the post-cast zone of the present invention. Figure 1 , the support-free device for pouring concrete in the post-cast zone of the present invention is described.

[0037] like Figure 1 As shown, the support-free device for pouring concrete in the post-cast strip of the present invention is used to support the template 13 at the post-cast strip 10. A pre-cast structure 11 is formed on both sides of the post-cast strip 10. The pre-cast structure 11 is a reinforced concrete structure. The support-free device of the present invention includes an embedded part 21 and a supporting beam 22. The embedded part 21 has a plurality of embedded parts 21. The embedded part 21 is embedded in the pre-cast structure 11. The embedded part 21 is set near the position of the post-cast strip 10. The lower part of the embedded part 21 extends out of the corresponding pre-cast structure 11. The bottom surface of the supporting beam 22 forms a connecting portion 211; there are also multiple supporting beams 22, and the setting direction of the supporting beams 22 is perpendicular to the setting direction of the post-casting strip 10. The supporting beams 22 are arranged at intervals along the setting direction of the post-casting strip 10, and the supporting beams 22 are connected to the connecting portion 211 of the embedded part 21. The supporting beams 22 support the formwork 13 at the post-casting strip 10, and the formwork 13 at the post-casting strip 10 is supported at the setting position by the supporting beams 22, so as to facilitate the subsequent concrete pouring construction at the post-casting strip 10.

[0038] Furthermore, the connecting portion 211 of the embedded part 21 is provided with an external thread, and the supporting beam 22 is provided with a connecting hole. The supporting beam 22 is sleeved on the connecting portion 211 of the embedded part 21 through the connecting hole, and then a double nut 23 is screwed on the connecting portion 211 to achieve the connection between the supporting beam 22 and the connecting portion 211. By tightening the double nut 23 to support the supporting beam 22, the supporting beam 22 supports the formwork 13, and the formwork 13 is supported on the bottom surface of the precast structure 11 on both sides.

[0039] Furthermore, a fastener 24 is provided between the double nut 23 and the supporting beam 22, and the fastener 24 is sleeved on the connecting portion 211. The fastener 24 is used to support the supporting beam 22. The fastener 24 is provided between the double nut 23 and the supporting beam 22 to provide a stable fastening force for the supporting beam 22.

[0040] Preferably, the fastener 24 is a U-shaped piece, which can be inverted at the bottom of the supporting beam 22, or can be clamped on the supporting beam 22. The length of the fastener 24 is greater than the width of the supporting beam 22. The fastener 24 is preferably formed by processing 50mm*5mm flat steel.

[0041] Furthermore, the supporting beam 22 is made of channel steel, which is attached to the bottom surface of the template 13 of the post-casting zone 10. Figure 4 As shown, the channel steels are arranged at intervals along the setting direction of the post-casting strip 10, and the channel steels are made of Q235B, 8~10# hot-rolled channel steel.

[0042] In another preferred embodiment, the supporting beam 22 is made of double-jointed channel steel, and the double-jointed channel steel is supported on the bottom surface of the template 13 in a back-to-back manner. The connecting portion 121 passes through the double-jointed channel steel, and then the fastener 24 is clamped on the connecting portion 121. The fastener 24 is used to support the double-jointed channel steel, and then the double nut 23 is screwed on the connecting portion 121 and the double nut 23 is tightened.

[0043] In a specific embodiment of the present invention, the upper part of the embedded part 21 is T-shaped, including a transverse rod and a vertical rod connected to the transverse rod; a reinforcing steel bar 25 is provided at the top of the embedded part 21 corresponding to the precast structure 11, and the reinforcing steel bar 25 is fixedly connected to the top transverse rod of the embedded part 21.

[0044] The reinforcement bars 25 improve the tensile strength of the embedded parts 21, providing stable and reliable support for the formwork 10. The reinforcement bars 25 are preferably arranged along the direction of the post-cast strip 10. In this embodiment, two reinforcement bars 25 are provided, located on either side of the vertical rod. The reinforcement bars 25 can be supported by support bars on the lower reinforcement bars 111 within the pre-cast structure 11.

[0045] In another preferred embodiment, Figure 2 and Figure 3 As shown, the reinforcing steel bars 25 are a reinforcing steel mesh, including longitudinal steel bars arranged along the setting direction of the post-cast strip 10, and also including transverse steel bars arranged along the setting direction perpendicular to the post-cast strip 10. The transverse steel bars are arranged at the bottom of the longitudinal steel bars, the transverse steel bars are arranged at intervals, and the transverse steel bars are connected to the longitudinal steel bars to form a reinforcing steel mesh.

[0046] When constructing the steel bars 111 in the precast structure 11, the reinforcing steel mesh installation position is supported on the lower steel bars, and then the setting position of the embedded part 21 is installed, the embedded part 21 is placed on the reinforcing steel mesh, and the T-shaped head is placed on the reinforcing steel mesh, and then it can be fixedly connected to the reinforcing steel mesh by welding.

[0047] Furthermore, the embedded part 21 includes a T-shaped sleeve and a screw threadedly connected to the T-shaped sleeve. When pre-embedded, the T-shaped sleeve is first placed in the steel bar 111 of the first cast structure 11, and then the lower part of the T-shaped sleeve is passed through the formwork 13. The height of the lower part of the T-shaped sleeve passing through the formwork is ≤30mm. Then, the screw is threadedly connected to the T-shaped sleeve, and then the screw is used to connect the supporting beam, fasteners and double nuts to fix the formwork 13.

[0048] Furthermore, the embedded parts 21 are arranged at intervals along the arrangement direction of the post-cast strip 10 .

[0049] In one embodiment of the present invention, the embedded screws are 16-20 mm Φ, fully threaded galvanized hangers with a tensile strength of ≥400 MPa and a longitudinal spacing of ≤800 mm. T-shaped sleeves are M16-M20, 304 stainless steel. Formwork 13 can be constructed of 18 mm thick wood or 2 mm thick steel, with a 20 mm wide chamfer at the bottom for ease of demolding. When installing formwork 13, double-sided tape is applied to the joint between it and the formwork of the precast structure 11 to prevent grout leakage.

[0050] like Figure 1 and Figure 2 As shown, a water-stop steel plate 12 is provided at the post-cast strip 10 , a portion of the water-stop steel plate 12 is buried in the pre-cast structure 11 , and a portion is located in the post-cast strip 10 .

[0051] The present invention also provides a support-free construction method for pouring post-cast strip concrete, which is described below.

[0052] like Figure 5 As shown, the construction method of the present invention comprises the following steps:

[0053] Executing step S101, when installing the reinforcement of the structure on both sides of the post-cast strip, providing embedded parts, laying the embedded parts in the reinforcement of the structure on both sides of the post-cast strip and fixedly connecting them to the corresponding reinforcement, allowing the lower part of the embedded parts to pass through the formwork of the structure on both sides of the post-cast strip and extend downward to form a connection part; then executing step S102;

[0054] Execute step S102 to set a template at the location of the post-casting strip; then execute step S103;

[0055] Execute step S103, set a supporting beam below the formwork at the post-casting strip, with the setting direction of the supporting beam perpendicular to the setting direction of the post-casting strip, and connect the supporting beam to the connecting part to support the formwork at the post-casting strip using the supporting beam.

[0056] In a specific embodiment of the present invention, when the supporting beam is provided, the supporting beam is sleeved on the connecting portion through the connecting hole provided thereon;

[0057] Double nuts are screwed onto the connection part, and the supporting beam and the connection part are fastened with the double nuts.

[0058] In a specific embodiment of the present invention, before the double nut is screwed onto the connecting portion, a fastener is provided, the fastener is sleeved onto the connecting portion, and the fastener is used to support the supporting beam;

[0059] A double nut is screwed onto the connection portion and tightened to clamp the fastener with the supporting beam.

[0060] In a specific embodiment of the present invention, when laying out the embedded parts, reinforcing steel bars are set in the steel bars of the structure on both sides of the post-cast strip, the reinforcing steel bars are used to support the top of the embedded parts, and the reinforcing steel bars are fixedly connected to the top of the embedded parts.

[0061] Furthermore, when arranging the embedded parts, the embedded parts are arranged at intervals along the setting direction of the post-casting strip.

[0062] In a specific embodiment of the present invention, Figure 1 As shown, the template at the post-cast strip of the present invention can be set up together with the template at the pre-cast structure 11. The template at the pre-cast structure is supported by a frame set below, while the template 13 at the post-cast strip 10 is supported by the embedded parts 21 and supporting beams 22. Since the concrete is poured at the post-cast strip 10, although part of the concrete of the pre-cast structures 11 on both sides will be poured on the template 13, the embedded parts 21 and supporting beams 22 can bear the weight of this part of the concrete. Furthermore, to ensure the safety of the structure, a temporary support can be set below the template 13 at the post-cast strip 10. When the template at the pre-cast structure 13 and the frame below are removed, the temporary support can be removed together.

[0063] After the formwork at the post-casting strip 10 is set up and before the formwork at the pre-casting structure 11 is removed, the embedded parts 21 and the formwork 13 need to be inspected. The pre-tightening force of the connection part of the embedded part 21 is controlled by a torque wrench, such as 60 N·m for an M16 bolt. The deflection in the formwork is tested, and the deformation after loading must be ≤ L / 400 (L is the width of the post-casting strip).

[0064] In a specific embodiment of the present invention, Figure 1 As shown, the template at the post-cast zone of the present invention can be supported after the pre-cast structure 11 is formed and demoulded, and the embedded parts 21 are embedded in the pre-cast structure 11, and the template 13 is supported by the embedded parts 21 and the supporting beams 22.

[0065] The support-free device and construction method for pouring concrete in the post-casting zone of the present invention are suitable for the construction of post-casting zones with a plate thickness of ≥150mm, and can save the cost of scaffolding rental and dismantling by about RMB 40 / m 2The installation speed is 3 times faster than that of traditional supports, and the single-stage construction time is ≤ 2 hours. The present invention can reduce the risk of template sinking, and the concrete forming flatness is ≤ 3mm / 2m.

[0066] The support-free device and construction method for pouring concrete in the post-cast strip of the present invention have no frame below the post-cast strip. The present invention adopts the form of upper hanging formwork. During the construction of the main structure, the formwork at the post-cast strip is hung downward in the form of embedded parts. After design verification and when the force meets the requirements, the formwork frame of the main structure can be completely dismantled without affecting the passage of the lower layer.

[0067] The present invention's support-free device and construction method for pouring concrete in post-cast strips improves construction efficiency. Conventional systems require extensive setup and dismantling of support systems, consuming significant time and labor. Conventional post-cast strip double-formwork structures often utilize floor-mounted support frames, which are not only labor-intensive but also require secondary formwork after formwork removal, further increasing construction costs and time. The present invention eliminates the need for secondary frame erection after dismantling.

[0068] The support-free device and construction method for pouring post-cast strip concrete of the present invention have low cost and do not require long-term support of the lower frame, thereby reducing the long-term rental and use costs of materials. At the same time, the materials selected by the present invention are easy to obtain, and the main materials can be reused, which can greatly reduce construction costs.

[0069] The present invention's support-free device and construction method for pouring post-cast concrete strips are easy to operate. Existing construction methods use upper support rods that can interfere with concrete troweling, impacting construction quality. The formwork removal process is cumbersome, requiring simultaneous operations on both sides, increasing construction difficulty. The present invention allows formwork removal with only a mobile operating platform, resulting in less material being removed and easier to organize and transport.

[0070] The support-free device and construction method for pouring post-cast strip concrete of the present invention are environmentally friendly. The present invention uses fewer materials, has low loss, and is easy to reuse. The embedded parts can be deepened during installation and can be used as part of the support bracket later.

[0071] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A support-free device for pouring concrete in a post-cast zone, wherein a pre-cast structure is formed on both sides of the post-cast zone, characterized in that: The support-free device comprises: A plurality of embedded parts are embedded in the precast structure and arranged near the postcast zone, wherein the lower portion of the embedded parts extends out of the bottom surface of the corresponding precast structure to form a connecting portion; A supporting beam is connected to the connecting portion, wherein the setting direction of the supporting beam is perpendicular to the setting direction of the post-casting strip, and the template at the post-casting strip is supported by the supporting beam.

2. The support-free device for pouring post-cast zone concrete according to claim 1, characterized in that: The connecting portion of the embedded part is provided with an external thread; The supporting beam is provided with a connecting hole, and the supporting beam is sleeved on the connecting portion of the embedded part through the connecting hole, and then a double nut is screwed on the connecting portion to realize the connection between the supporting beam and the connecting portion.

3. The support-free device for pouring concrete in the post-cast zone according to claim 2, characterized in that: A fastener is provided between the double nut and the supporting beam, and the fastener is sleeved on the connecting portion.

4. The support-free device for pouring post-cast zone concrete according to claim 1, characterized in that: The upper portion of the embedded part is T-shaped and includes a transverse rod and a vertical rod connected to the transverse rod; Reinforced steel bars are provided in the precast structure at the tops of the embedded parts, and the reinforced steel bars are fixedly connected to the top transverse bars of the embedded parts.

5. The support-free device for pouring post-cast zone concrete according to claim 1, characterized in that: The embedded parts are arranged at intervals along the arrangement direction of the post-cast strip.

6. A construction method for pouring post-cast zone concrete without support, characterized in that: The steps include: When constructing the steel bars of the structure on both sides of the post-cast strip, provide embedded parts, lay the embedded parts in the steel bars of the structure on both sides of the post-cast strip and fix them to the corresponding steel bars, and let the lower part of the embedded parts pass through the templates of the structure on both sides of the post-cast strip and extend downward to form a connection part; Set up the formwork at the location of the post-casting strip; A supporting beam is set below the formwork at the post-casting strip, the setting direction of the supporting beam is perpendicular to the setting direction of the post-casting strip, and the supporting beam is connected to the connecting part, and the supporting beam is used to support the formwork at the post-casting strip.

7. The support-free construction method for pouring post-cast zone concrete according to claim 6, characterized in that: When setting the supporting beam, the supporting beam is sleeved on the connecting portion through the connecting hole provided thereon; Double nuts are screwed onto the connection part, and the supporting beam and the connection part are fastened with the double nuts.

8. The support-free construction method for pouring post-cast zone concrete according to claim 7, characterized in that: Before screwing the double nut on the connection part, a fastener is provided, and the fastener is placed on the connection part, and the fastener is used to support the supporting beam; A double nut is screwed onto the connection portion, and the double nut is tightened so that the double nut and the supporting beam clamp the fastener.

9. The support-free construction method for pouring post-cast zone concrete according to claim 6, characterized in that: When laying out the embedded parts, reinforcing steel bars are set in the steel bars of the structure on both sides of the post-cast strip, the reinforcing steel bars are used to support the top of the embedded parts, and the reinforcing steel bars are fixedly connected to the top of the embedded parts.

10. The support-free construction method for pouring post-cast zone concrete according to claim 6, characterized in that: When laying out the embedded parts, arrange them at intervals along the direction of the post-cast strip.

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